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Multiple Steam Boiler Sizing Methods

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HowardLong
HowardLong Member Posts: 16
in Strictly Steam

Good morning,

I'm looking into installing a 2 boiler system in a building that currently has a old 300,000btu boiler as an experiment on one of our family buildings, so I have leeway to play around. I've read the thread on 2 boiler systems but I still have questions. I'm thinking of installing one that's 100,000btu and another 200,000btu to run one unit on the warmer days.

Would I need to worry about the water returning to the boiler fast enough if I'm installing a gravity system?

And if I'm using a gravity system do I not need to install overflow F&Ts still or is that only for pumped systems?

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 19,172

    A lot more work and a lot more piping to make steam work successfully with multiple boiler. It can be done but $$$$.

    Now if you install two boiler and keep 1 boiler valved off and manually change them over manually then there are no issues.

    The issues have to do with multiple boiler on line at the same time. Controlling the condensate return can be difficult. You would need a boiler feed tank if the boilers have different water levels, overflow traps to control water level from condensation etc.

    If gravity return you could make a pad so the boiler water levels match.

    But there are a lot of issues and increased cost with multiple boilers.

    mattmia2

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